It was an average day in the Roswall mansion, Subaru did his knightly duties for the day and was walking back to his room after he ate dinner. Subaru then ran into Petra dusting a vase and he decided to spark up a conversation. "Hey, Petra!" Subaru shouted Petra then responded "H-hey Subaru-Sama" petra said quietly. "So, I heard Frederica was teaching you math… How well is it going so far? Petra, excited after Subaru was talking to her, proudly exclaimed "I'm learning quite a bit! So far Frederica has taught me the basics of addition" after hearing this it reminded Subaru of the most hilarious thing of all time from back in Japan. This sparked Subaru to try to replicate it with Petra. "So Petra I'm going to quiz you right now!" before she could answer Subaru quickly said, "Petra here's an easy question… what's 9 + 10?" Petra was shocked by the question, she didn't think Subaru would give her such an easy question so she confidently answered back "Subaru that's too easy it's obviously 21" After hearing this response Subaru violently starting laughing so much that he couldn't breathe and he suffocated to death. THE END